export interface IndexDoc {
    readonly id: string;
    readonly fields: ReadonlyArray<{
        readonly field: string;
        readonly locale?: string;
        readonly text: string;
    }>;
}
export interface IndexHit {
    readonly id: string;
    readonly score: number;
    readonly field: string;
    readonly locale?: string;
    readonly text: string;
    readonly offset: number;
}
export interface QueryOptions {
    readonly limit?: number;
    readonly match?: 'any' | 'all';
    readonly prefix?: boolean;
    readonly fields?: readonly string[];
}
export interface IndexSnapshot {
    readonly v: 1;
    readonly fieldStats: ReadonlyArray<[string, {
        df: [string, number][];
        n: number;
        totalLen: number;
    }]>;
    readonly docs: ReadonlyArray<{
        id: string;
        field: string;
        locale?: string;
        text: string;
        len: number;
        tf: [string, number][];
        firstOffset: [string, number][];
    }>;
}
export declare class InvertedIndex {
    private readonly fieldStats;
    private readonly docs;
    static build(docs: ReadonlyArray<IndexDoc>): InvertedIndex;
    query(query: string, opts?: QueryOptions): IndexHit[];
    toSnapshot(): IndexSnapshot;
    static fromSnapshot(s: IndexSnapshot): InvertedIndex;
}